Claude Fable 5 vs MAI-Thinking-1
Claude Fable 5 (2026) and MAI-Thinking-1 (2026) are frontier-tier reasoning models from Anthropic and Microsoft AI. Claude Fable 5 ships a 1m-token context window, while MAI-Thinking-1 ships a 256k-token context window. On SWE-bench Verified, Claude Fable 5 leads by 22.5 pts. This comparison covers specs, pricing, API access, capabilities, benchmarks, input and output token costs, and production fit for coding and agent workloads.
Claude Fable 5 is safer overall; choose MAI-Thinking-1 when provider fit matters.
Decision scorecard
Local evidence first| Signal | Claude Fable 5 | MAI-Thinking-1 |
|---|---|---|
| Best for | reasoning-heavy apps, multimodal apps, and tool-calling agents | reasoning-heavy apps and tool-calling agents |
| Decision fit | Coding, RAG, and Agents | Coding, RAG, and Agents |
| Context window | 1m | 256k |
| Cheapest output | $50/1M tokens | - |
| Provider routes | 4 tracked | 1 tracked |
| Shared benchmarks | SWE-bench Verified leader | 2 rows |
Decision tradeoffs
- Claude Fable 5 holds a shared-benchmark lead on SWE-bench Verified, ahead by 22.5 points.
- Claude Fable 5 has the larger context window for long prompts, retrieval packs, or transcript analysis.
- Claude Fable 5 has broader tracked provider coverage for fallback and procurement flexibility.
- Claude Fable 5 uniquely exposes Vision, Multimodal, and Structured outputs in local model data.
- Local decision data tags Claude Fable 5 for Coding, RAG, and Agents.
- Local decision data tags MAI-Thinking-1 for Coding, RAG, and Agents.
Monthly cost at traffic
Estimate token spend from the cheapest tracked input and output route or tier on this page.
Claude Fable 5
$20,500
Cheapest tracked route/tier: Anthropic
MAI-Thinking-1
Unavailable
No complete token price in local provider data
Cost delta unavailable until both models have sourced input and output token prices.
Switch friction
- Provider overlap exists on Microsoft Foundry; start route-level A/B tests there.
- Check replacement coverage for Vision, Multimodal, and Structured outputs before moving production traffic.
- Provider overlap exists on Microsoft Foundry; start route-level A/B tests there.
- Claude Fable 5 adds Vision, Multimodal, and Structured outputs in local capability data.
Specs
| Specification | ||
|---|---|---|
| Released | 2026-06-09 | 2026-06-02 |
| Context window | 1m | 256k |
| Parameters | — | 1T total / 35B active |
| Architecture | decoder only | sparse mixture of experts |
| License | Proprietary | Proprietary |
| Openness | Proprietary | Proprietary |
| Commercial use | Commercial use with conditions | Commercial use with conditions |
| Knowledge cutoff | - | - |
Pricing and availability
| Pricing attribute | Claude Fable 5 | MAI-Thinking-1 |
|---|---|---|
| Input price | $10/1M tokens | - |
| Output price | $50/1M tokens | - |
| Providers |
Capabilities
| Capability | Claude Fable 5 | MAI-Thinking-1 |
|---|---|---|
| Vision | Yes | No |
| Multimodal | Yes | No |
| Reasoning | Yes | Yes |
| Function calling | Yes | Yes |
| Tool use | Yes | Yes |
| Structured outputs | Yes | No |
| Code execution | No | No |
| IDE integration | No | No |
| Computer use | No | No |
| Parallel agents | No | No |
Benchmarks
| Benchmark | Claude Fable 5 | MAI-Thinking-1 |
|---|---|---|
| SWE-bench Verified | 96.0 | 73.5 |
| SWE-bench Pro | 80.3 | 52.8 |
Deep dive
On shared benchmark coverage, SWE-bench Verified has Claude Fable 5 at 96 and MAI-Thinking-1 at 73.5, with Claude Fable 5 ahead by 22.5 points; SWE-bench Pro has Claude Fable 5 at 80.3 and MAI-Thinking-1 at 52.8, with Claude Fable 5 ahead by 27.5 points. The largest visible gap is 27.5 points on SWE-bench Pro, which matters most when that benchmark mirrors your workload. Treat isolated benchmark wins as directional, because provider routing, prompt style, and tool access can move real application results.
The capability footprint differs most on vision: Claude Fable 5, multimodal input: Claude Fable 5, and structured outputs: Claude Fable 5. Both models share reasoning mode, function calling, and tool use, so the practical split is not just feature count. Use those differences to decide whether the page is about raw model quality, agentic coding support, multimodal ingestion, or predictable structured API behavior.
Pricing coverage is uneven: Claude Fable 5 has $10/1M input tokens and MAI-Thinking-1 has no token price sourced yet. Provider availability is 4 tracked routes versus 1. Treat unknown pricing as an integration gap, then verify the route you will actually call before estimating production spend.
Choose Claude Fable 5 when long-context analysis, larger context windows, and broader provider choice are central to the workload. Choose MAI-Thinking-1 when provider fit are more important. For production, rerun your own prompts through the exact provider, region, and tool stack you plan to ship.
FAQ
Which has a larger context window, Claude Fable 5 or MAI-Thinking-1?
Claude Fable 5 supports 1m tokens, while MAI-Thinking-1 supports 256k tokens. That gap matters most for long documents, large codebases, retrieval-heavy agents, and conversations where earlier context must remain visible.
Is Claude Fable 5 or MAI-Thinking-1 open source?
Claude Fable 5 is listed under Proprietary. MAI-Thinking-1 is listed under Proprietary. License labels affect whether you can self-host, redistribute weights, or rely only on hosted APIs, so confirm the upstream license before deployment.
Which is better for vision, Claude Fable 5 or MAI-Thinking-1?
Claude Fable 5 has the clearer documented vision signal in this comparison. If vision is mission-critical, validate it against the provider endpoint because model-level support and API-level exposure can differ.
Which is better for multimodal input, Claude Fable 5 or MAI-Thinking-1?
Claude Fable 5 has the clearer documented multimodal input signal in this comparison. If multimodal input is mission-critical, validate it against the provider endpoint because model-level support and API-level exposure can differ.
Which is better for reasoning mode, Claude Fable 5 or MAI-Thinking-1?
Both Claude Fable 5 and MAI-Thinking-1 expose reasoning mode. The better choice depends on benchmark fit, context budget, pricing, and whether your provider route exposes the same capability surface. Use this as a quick comparison signal, then confirm the provider-specific limits before committing to production.
Where can I run Claude Fable 5 and MAI-Thinking-1?
Claude Fable 5 is available on Anthropic, AWS Bedrock, GCP Vertex AI, and Microsoft Foundry. MAI-Thinking-1 is available on Microsoft Foundry. Provider coverage can affect latency, region availability, compliance posture, and fallback options.
Continue comparing
Last reviewed: 2026-06-10. Data sourced from public model cards and provider documentation.